Year	Number
1970	231600
1971	263100
1972	288500
1973	309200
1974	268700
1975	244300
1976	288000
1977	226100
1978	185800
1979	197400
1980	242900
1981	327600
1982	335300
1983	357500
1984	398800
1985	471200
1986	527500
1987	594100
1988	592600
1989	650800
1990	620300
1991	635600
1992	756400
1993	752000
1994	716400
1995	749900
1996	743000
1997	772300
1998	789900
1999	861400
2000	944595
2001	1027528
2002	1103184
2003	1117329
2004	1403293
2005	1667316
2006	1720306
2007	2290179
2008	2715017
2009	2914056
2010	3347022
2011	4440917.69083987
2012	5001121.86524561
2013	5671501
2014	6274582
2015	7074779
2016	8242114
2017	9566378
2018	11501244
2019	12631216
2020	4940183
2021	7065954